301 to 306 of 306 Java Jobs in London

incrementally without disrupting live trading. This is not a greenfield role. Success comes from adding value immediately within a large, demanding codebase — understanding existing Java and .NET systems well enough to reason about trade-offs, guide refactoring or selective rewrites, and make sound architectural decisions under pressure. The roadmap … using agentic AI tools to accelerate understanding of large, unfamiliar codebases and complex system behaviour, not just development. Comfortable reading and reasoning about large Java and .NET codebases to inform architectural decisions, modernization strategy, and platform transition planning London‐based, with on‐site presence required 3 days per week minimum ...

existing functionality for The Guardian’s Android apps Our current codebase is 90%+ in Kotlin, but you may be required to work with Java too. You won't be coding in isolation - our culture is strongly collaborative, whether pair programming with other developers or working closely with other stakeholders. … have a strong interest in growing your skills You’re confident coding in Kotlin building in Android studio. You have some experience with Java or are willing to learn. You are curious, passionate about technology and finding creative solutions to complex problems. You have experience of, and a willingness ...

Lead Rust Engineer Up to 120,000/130,000 London Low Latency | Async Rust | Tokio Drones We have a new and exclusive partnership with one of the most exciting scale-ups in Europe, who ...

Technical Architect - NHS experience is ESSENTIAL Key Tech: Java & AWS Day Rate 700/day - Inside IR35 Location Remote with occasional need in London (roughly 1x/quarter) Duration 6 months (with view to extend) ROLE DESCRIPTION Brio Digital are supporting a consultancy on a major NHS digital programme … engineering teams, setting direction on tooling, patterns, and best practice Design and oversee cloud infrastructure on AWS, ensuring high availability, performance, and security Drive Java-based development standards and architectural decisions across the codebase Engage with NHS stakeholders and third party suppliers to align technical approaches with programme requirements Identify ...

Technical Architect - NHS experience is ESSENTIAL Key Tech: Java & AWS Day Rate £700/day - Inside IR35 Location Remote with occasional need in London (roughly 1x/quarter) Duration 6 months (with view to extend) ROLE DESCRIPTION Brio Digital are supporting a consultancy on a major NHS digital programme … engineering teams, setting direction on tooling, patterns, and best practice Design and oversee cloud infrastructure on AWS, ensuring high availability, performance, and security Drive Java-based development standards and architectural decisions across the codebase Engage with NHS stakeholders and third party suppliers to align technical approaches with programme requirements Identify ...

CICS Liberty environments on z/OS. This role focuses on infrastructure engineering rather than application development, supporting modern, secure, and highly available Java workloads within CICS. You will work at the intersection of traditional Mainframe systems and contemporary integration and DevOps practices. Key Responsibilities Provide deep systems engineering expertise … logs Expertise in WebSphere Liberty configuration (server.XML, features, shared libraries) JVM tuning on z/OS (heap sizing, garbage collection behaviour) Experience managing Java workloads within CICS (JVM server life cycle, diagnostics) Contract Details Duration: 6 months (with potential extension) Day Rate: Up to £400 per day (Inside IR35) Location ...